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The Sun activity increases during every ...

5 years
11 years
22 years
1300 years
Solar cycles have an average duration of about 11 years. The periodic changes in the Sun's activity include changes of the levels of solar radiation and the number and size of sunspots.
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Answers by country

5 years
11 years
22 years
1300 years
answers
flagFrance
5%
75%
10%
10%
20
flagAustria
19%
68%
2%
7%
76
flagGreece
20%
60%
5%
15%
20
flagRepublic of Ireland
16%
58%
16%
8%
12
flagthe Netherlands
8%
58%
25%
8%
12
flagGermany
13%
56%
14%
15%
424
flagPakistan
12%
54%
20%
12%
24
flagCanada
19%
52%
14%
14%
21
flagthe United States
12%
51%
18%
16%
247
flagthe United Kingdom
11%
51%
19%
17%
129
flagSwitzerland
5%
51%
20%
20%
35
flagAustralia
11%
48%
11%
23%
43
flagIndia
19%
44%
13%
21%
383
flagPoland
12%
42%
19%
25%
8201
flagthe United Arab Emirates
20%
40%
6%
33%
15
flagthe Philippines
18%
31%
21%
28%
32
flagUnknown
18%
31%
31%
18%
16
flagEstonia
10%
30%
60%
0%
10

The bright circle around the Sun seen in the picture is known as a halo. What causes it?

refraction of light in ice crystals
refraction in the lens of the eye or lens
refraction of light in water drops
reflections from the water surface

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the Sun
the Moon
both are identical
sometimes the Moon, sometimes the Sun

In which month is the Earth closest to the Sun?

in January
in March
in June
there is no difference

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in Budapest, Hungary
in Prague, Czech Republic
in Istambul, Turkey